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4 4 New world averages of LHCb + CDF + BaBar + Belle  a CP dir = -(0.656  0.154)%, 4.3  effect a CP ind = -(0.025  0.235)% Before claiming new physics effects, it is important to have a reliable SM estimate of  A CP Can we have reliable estimate of strong phases and hadronic matrix elements ? Can the LHCb result be accommodated in SM ? Given the expt’l results, can one predict DCPV in other modes ?

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6 Why singly Cabibbo-suppressed decays ? Amp = V * cd V ud (tree + penguin) + V* cs V cs (tree’ + penguin) DCPV is expected to be the order of   : strong phase In SM, CPV is expected to be very small in charm sector Consider DCPV in singly Cabibbo-suppressed decays Penguin is needed in order to produce DCPV at tree & loop level Common folklore: CPV is at most in SM; is a “smoking gun” signature of NP